Question 1

How do I mock a class method with Mocha in Minitest?

Accepted Answer

Use syntax like Class.expects(:method).with(args).returns(value) as shown in the quick start. Ensure Mocha is loaded after Minitest in your test helper to avoid setup errors.

Question 2

Mocha vs RSpec mocks: which is better for Ruby testing?

Accepted Answer

Mocha provides a unified syntax across multiple test frameworks, making it versatile for mixed environments, while RSpec mocks are deeper integrated with RSpec's DSL. Choose based on framework consistency and team preference.

Question 3

Can I use Mocha with Ruby on Rails applications?

Accepted Answer

Yes, include Mocha in your Gemfile and require it after Rails test help in test_helper.rb, as detailed in the Rails setup section for frameworks like Minitest.

Question 4

How to stub a method for all instances of a class in Mocha?

Accepted Answer

Use Class.any_instance.stubs(:method).returns(value) as demonstrated in the partial mocking examples. This applies stubs consistently across every instance without manual repetition.

Question 5

Is Mocha good for testing external API calls?

Accepted Answer

Mocha can mock HTTP client methods to isolate API dependencies, but for more comprehensive HTTP request mocking, consider pairing it with libraries like WebMock for enhanced control.

Question 6

What happens if I stub a non-existent method accidentally in Mocha?

Accepted Answer

Mocha can be configured to warn or raise an error for stubbing non-existent methods via the Mocha::Configuration settings, helping catch typos and maintain test accuracy.

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